How do you create a simple single vertex mesh with no actual faces whatsoever?
Create a cube or a plane or anything really, go into edit mode and select all with &quot;a&quot;.  Then press &quot;m&quot; at center to merge all the vertices into one.
Alternatively enable the &quot;mesh: extra objects&quot; module in preferences and then you get an option to add a single vert.1
Specifically what this demo has done though is create a single vert as mentioned above, then duplicated it and moved the second one a little way off, then with both vertices selected they made an edge between them with &quot;f&quot;.  Now you can hop into object mode and follow the rest of that little tutorial to make your cylinder.